论文标题
由石墨烯中的费米速度调制控制的完美山谷过滤器
Perfect valley filter controlled by Fermi velocity modulation in graphene
论文作者
论文摘要
在这项工作中，我们研究了通过磁性和电屏障的组合形成的石墨烯中山谷过滤器中费米速度调制的影响。使用系统的有效狄拉克方程式，我们使用转移矩阵形式主义来获得透射率。我们验证了石墨烯中的山谷传输对费米速度调制非常敏感，该速度调制能够选择哪个山谷将通过完美的过滤进行过滤。同样，可以使用费米速度调制来过滤山谷或使山谷过滤器透明。它揭示了费米速度是一种功能强大的工具，可用于调整石墨烯谷滤波器，因为它在其运输属性中具有总控制。
In this work we investigate the effects of a Fermi velocity modulation in a valley filter in graphene created by a combination of a magnetic and electric barrier. With the effective Dirac equation of the system, we use the transfer matrix formalism to obtain the transmittance. We verify that the valley transport in graphene is very sensitive to a Fermi velocity modulation, which is able to choose which valley will be filtered with perfect filtering. Also, it is possible to use a Fermi velocity modulation to filter both valleys or to make the valley filter transparent. It reveals that the Fermi velocity is a powerful tool that can be used to tune a graphene valley filter, since it has a total control in its transport properties.
